Helmet for use in the driving of reinforced-concrete piles.



' G. W. URAWSHAW.

HELMET FOR USE IN THE DRIVING or REINFORCED CONCRETE PILES.

APPLICATION FILED JULY6,1912. 1,060,668. Patented May 6, 1913.

5 SHEETB-SHBBT 1.

G. W. ORAWSHAW. HELMET FOR USE IN THE DRIVING 0P REINFORCED CONCRETEPILES. APPLICATION FILED JULY 6, 1912.

1,060,668. Patented May 6, 1913.

5 SHEETSSHEET 2.

G. W. GRAWSHAW. HELMET FOR USE IN THE DBIVING'OP REINFORCED OONOBBTBPILES.

nrmonrox rmzn JULY 6, 1m.

Patentd May 6, 1913.

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G. W. GRAWSHAW. HELMET FOR USE IN THE DRIVING 0P REINFORCED CONCRETEPILES.

APPLICATION FILED JULY 6, 1912.

1,060,668. Patented May 6,1913.

5 SHEETS-SHEET 4.

G. W. ORAWSHAW. HELMET FOB. USE IN THE DRIVING 0F REINFORCED CONCRETEFILES.-

APPLICATION FILED JULY 6, 1912.

1,060,668. Patented May 6, 1913. 5 sums-sum 5.

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wwfwi mmm WM UNITED STATES PATENT or 1 ennvAsE WATSON GRAWSHAW, orterms; nner-Ann;-

HELMET FOR usn IN THE DRIVING or REINFORCED-CONCRETE Finns.

Specification of Letters Patent.

' Patented May 6, 1913.

Application filed July 6, 1912. Serial No. 707,988. i

To all whom it may concern."

Be it known that I, GnRvAsE WA'rsoN CRAwsHAw, a subject of the King ofGreat Britain and Ireland, and resident of Leeds, England, haveinventedcertain new and useful Improvements in Helmets for'Use in theDriving of Reinforced-Concrete Piles,

of which the following is a specification.

This invention refers to and consists of an improved construction ofhelmet foruse in the driving of reinforced concrete piles.

Heretofore, helmets for this purpose have comprised a'cast-iron boxadapted, at one end, to fit over and inclose the top end of the pile,for about a foot, and at the other end adapted to stand above the end ofthe pile for another foot or so, the helmet, or box, being dividedinteriorly by a transverse partltion which bears against the end of thepile or against a filling of saw-dust, or the like, inserted between itand the end of the pile. Q

Into the upper projecting end of the helmet, or box, fits the lower endof a wooden dolly, thatis, a length of hard wood about three a scantlingsimilar to that of the pile. Upon the upper end of the dolly 1s fittedan iron, or steel, hoop for preventing any. bursting of the wood underthe impact of the monkey, or hammer, by which the driving of the pile isefiected. With such construction of helmet or boxthe overall length isabout five feet, and in order to keep the helmet or box in line with thepile and guide the pile, it is usual to provide a gage bolt and formedin the framework of-the pile driving machine and the bolt being securedto the dolly at or near its center and passing through the leaders.

This invention has for its object to provide a construction of helmet'and' dolly which will be much shorter .in length than the said ordinaryhelmet and dolly and therefore more readily handled. (applied andremoved) than the ordinary helmet and dolly and which will-increase theworking room for the monkey to a maximum.

According to the invention, the helmet comprises a plate or cap designedto fit over the head or crown of the pile, such cap being formed with arecess or socket to re- 'ceive the dolly and having depending lugs orarms for holding or securingthe 'cap in position, while, on oppositesides of said feet long or more and of.

leaders these latter being POSltlOIl onor removlng it from'the pile.

Other details will be hereinafter ex;

plained by reference to the accompanyingdrawings whereon-' ca ,ears orloops are provided to receive the 1 'l1 tlng means when placing the capinto Figure 1 illustrates, in elevation, the up- I per part ofa pileshowing the improved helmet in position thereon, Fig. 2 illustrates aplan of Fig. 1 with the. dolly removed.

Fig. 3 illustrates a half exterior and half section'al elevation as seenat right angles tof Fig. 1. Fig. 4: illustrates an inverted plan of thehelmet with the pile removed. Figs. 5, 6 and 7 are similar views toFigs. 1, 2 and 3 respectively, illustrating a modified construction ofhelmet. Figs. 8 and 9 illustrate a part side elevation and plan,respectively of a further modification;

Referring now to proved helmet comprises a stout steel ,cap 'or plate a,circular,.hexagon,. square or'jother suitable shape in plan, but for. asquare pile, preferably hexagon, and of a diameter slightly larger thanthat of the pile. 1 Rising from such cap or plate is an annular flange 6preferably circular in plan and about five inches high. The inner faceof this flange is slightly inclined and formsa conical re, cess orsocket, see

exterior and the section of the flange is therefore tapered, thenarrower part being uppermost.

arms a, a which are arrange at diametrically opposite points and each ofwhich is, by preference, and designed to lie parallel with and alongsideone face of the pile. At their lower ends these arms are each providedwith a slot 0 which, when the cap is on the ile, comes opposite a holein the pile and al ows of a bolt (1 being passed through the arms andthe pile,

the drawings, the an Fig. 3. The flange b is also, by preference,slightly inclined onits 9o Ext-ending .down. from the late are ,two-

abouteighteen inches long i' for the purpose of securely holding thehelmet to the 'pile. f Also depending from lugs or flanges e, 'c whichoccupy positions intermediate of the said armsand lie against or near tothe other and right-angled faces of the pile. While the longer arms a, cand the bolt d serve to hold the helmet down on to the pile, the shortlugs help to prevent it twisting or moving sidewise. In one with theseshort arms or lugs e, e

(or if. desired in one with the long arms) and the 4 the plate a are twoshort j i end of the pile .is placed a disk or washer of .wood,papier'mach or other suitable 'maflange 6 are'loops or rings 3, e bywhich the helmet may be handled in placing it on, and'lifting itoff,-the' pile, and by which also the-pile may be lifted in slinging orpitching it into position, Or the loops e' 6 may be arranged at thecorners and designed sothat they lie within the area'of, the hel--met,-see Figs. 8 and 9. With this latter arrangement there is lessliability of the loops being fractured or broken off. K Into the-conical recess, formed by the flange b on the'to-p of the cap, isfitted the lower conical end of a. short block of hard wood f,"preferably about nine inches long,

which constitutes the dolly. At its com- 'cal upper end the dolly f isbound by a metal hoop f in likemanner to the ordinaryl dolly the grainof the wood running lengthwise of the dolly Between the steel plate aand the top terial g, by preference, about two inches thick andapproximately the same shape in plan or nearly so as that of the pile.For

' more effectually retaining the washer g in position, the plate or thearms-may be recessed or the arms may be joined or connected to eachother by depending flanges a, see s.5and 6. '1

With a elmet made as aforesaid-and its over-all length from the bottomface ofthe.

plate to the top of the dolly not' exceeding, sa a foot, or notexceeding two feet /s1x' inc es includingthe arms, a very comactconstruction of helmet is obtained. urther, the weight as compared withthat y of the ordinary helmet is considerably reduced, which enables thehelmet to be handled man'ually instead of by machinery, andalso tobe'transported by rail at less cost thanthe ordinary helmet. The g ge ois also rendered unnecessary 'And by the use of a wood washer g in placeof sawdust, the trouble of repeatedly renewing the sawdust is done awaywith. A further advantagefis that by shortening the helmet and dolly itenables the ordinary machine. for driving piles to be used for drivingpiles of greater variety in length than heretofore.

. The arms 0 will preferably be wider where and the flange above theplate and the arms will be stiffened by webs or ridges b.

' What I claim is 1. A helmet for use in driving reinforced concretepiles, comprising a stout steel plate,

' they join the plate than at the lower ends,

arms and lugs depending from said plate and designed to lie alongsidetwodiametrically opposite sides of the pile, an annular flange rising fromthe top face of said plate,

and forming a socket, a. short wooden dolly or block 'fitting the saidsocket, thetdolly and flange being tapered substantially as set forth. w

2. A helmet for use in driving r inforced concrete piles, comprising a.stout teel plate with two depending arms at points diamet-- ric'allyopposite each other, and each arm slotted near its free end, two shorterarms or lugs depending from said plate and loops 'or rings for enablingthe helmet to be 1i

